Yes, cell phones work remarkably well in the Channel Tunnel (Chunnel) thanks to a sophisticated fibre-optic antenna system installed by Eurotunnel in partnership with major UK and French carriers like EE, Vodafone, and Orange. As of 2026, passengers on both the Eurostar and Le Shuttle have access to consistent 4G and 5G mobile services throughout the entire 35-minute underwater journey. The signal quality is designed to be equivalent to being above ground in London or Paris, allowing you to stream video, make calls, or browse the web without interruption while 75 meters below the seabed. Additionally, Eurostar trains provide their own free onboard Wi-Fi, which seamlessly connects to the tunnel's infrastructure. While there might be a very brief "handover" moment as the network switches from a UK provider to a French one at the midpoint of the tunnel, the transition is usually unnoticeable for most modern smartphones, making the Chunnel one of the best-connected undersea environments in the world.